If it was up to me, I would go with the Plextor, they make the best drives, plus it's scsi. The kenwood however seems like a really nice/extremely fast drive. You also said you wanted to be compatible with Clone CD, but I don't see any need for that, since you have a cdwriter that you can use with that.

You also have a DVD Rom and a Writer so maybe you're better off spending the money somewhere else.